From patchwork Mon Aug 22 19:07:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 12951192 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7ECCC28D13 for ; Mon, 22 Aug 2022 19:07:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237871AbiHVTHm (ORCPT ); Mon, 22 Aug 2022 15:07:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237405AbiHVTHl (ORCPT ); Mon, 22 Aug 2022 15:07:41 -0400 Received: from mail.baikalelectronics.com (mail.baikalelectronics.com [87.245.175.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3F96B140D9; Mon, 22 Aug 2022 12:07:40 -0700 (PDT) Received: from mail (mail.baikal.int [192.168.51.25]) by mail.baikalelectronics.com (Postfix) with ESMTP id 9C133DA4; Mon, 22 Aug 2022 22:10:47 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.baikalelectronics.com 9C133DA4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baikalelectronics.ru; s=mail; t=1661195447; bh=U/Og/epJCU9HiY8k0X470O4ZspZ9jVIn5RwZ2z1a2AQ=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=AHmrNwKAgwNSO2C9xPPbFN7a1bZqNebf/6nrRmz7VFnyETUqUI2zQFoy6hsFHkdHu 3JXKne8dIIC+Hmyau8o2t3a/7Dav6/3BLWIQ5DZIho1T/Kwl0zzNML1ICRm0twwQid q9L8na8h+t8MbKcp1gA9DFhQ+J0VFQJp9PgwfU1I= Received: from localhost (192.168.168.10) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 22 Aug 2022 22:07:33 +0300 From: Serge Semin To: Rob Herring , Michal Simek , Borislav Petkov , Mauro Carvalho Chehab , Tony Luck , James Morse , Robert Richter , Manish Narani CC: Serge Semin , Serge Semin , Alexey Malahov , Michail Ivanov , Pavel Parkhomenko , Punnaiah Choudary Kalluri , Dinh Nguyen , Rob Herring , Krzysztof Kozlowski , , , , , Borislav Petkov Subject: [PATCH 02/20] EDAC/synopsys: Fix generic device type detection procedure Date: Mon, 22 Aug 2022 22:07:12 +0300 Message-ID: <20220822190730.27277-3-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20220822190730.27277-1-Sergey.Semin@baikalelectronics.ru> References: <20220822190730.27277-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org First of all the enum dev_type constants define the Memory devices, i.e. DRAM chips, DQ-bus width (see the enumberation kdoc for details). So what is returned from the zynqmp_get_dtype() procedure is definitely wrong. Secondly the DRAM chips type has nothing to do with the data bus width specified in the MSTR.data_bus_width CSR field. The later one just determines the part of the whole DQ-bus used to access the data from the all DRAM chips. So it doesn't indicate the individual chips type. Thirdly the DRAM chips type can be determined only in case of the DDR4 protocol by means of the MSTR.device_config field state (it is supposed to be set by the system firmware). Finally the DW uMCTL2 DDRC ECC capability doesn't depend on the memory chips type. Moreover it doesn't depend on the data bus width in runtime either. The IP-core reference manual says in [1,2] that the ECC support can't be enabled during the IP-core synthesizes for the DRAM data bus widths other than 16, 32 or 64. At the same time the bus width mode (MSTR.data_bus_width) doesn't change the ECC feature availability. Thus it was wrong to determine the ECC state with respect to the DQ-bus width mode. Let's fix all of the mistakes above in the zynqmp_get_dtype() and zynqmp_get_ecc_state() methods. In accordance with the DW uMCTL2 DDRC nature the DRAM chips type in most of the cases will be unknown except when DDR4 protocol is utilized. ECC availability will be determined by the ECCCFG0.ecc_mode field state only. [1] DesignWare® Cores Enhanced Universal DDR Memory Controller (uMCTL2) Databook, Version 3.91a, October 2020, p. 421. [2] DesignWare® Cores Enhanced Universal DDR Memory Controller (uMCTL2) Databook, Version 3.91a, October 2020, p. 633. Fixes: b500b4a029d5 ("EDAC, synopsys: Add ECC support for ZynqMP DDR controller") Signed-off-by: Serge Semin --- drivers/edac/synopsys_edac.c | 56 +++++++++++++++++------------------- 1 file changed, 26 insertions(+), 30 deletions(-) diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c index c78fb5781ff9..39c63dd1b9be 100644 --- a/drivers/edac/synopsys_edac.c +++ b/drivers/edac/synopsys_edac.c @@ -142,7 +142,12 @@ #define ECC_CTRL_EN_CE_IRQ BIT(8) #define ECC_CTRL_EN_UE_IRQ BIT(9) -/* DDR Control Register width definitions */ +/* DDR Master Register 0 definitions */ +#define DDR_MSTR_DEV_CFG_MASK GENMASK(31, 30) +#define DDR_MSTR_DEV_X4 0x0 +#define DDR_MSTR_DEV_X8 0x1 +#define DDR_MSTR_DEV_X16 0x2 +#define DDR_MSTR_DEV_X32 0x3 #define DDRCTL_EWDTH_16 2 #define DDRCTL_EWDTH_32 1 #define DDRCTL_EWDTH_64 0 @@ -671,26 +676,25 @@ static enum dev_type zynq_get_dtype(const void __iomem *base) */ static enum dev_type zynqmp_get_dtype(const void __iomem *base) { - enum dev_type dt; - u32 width; - - width = readl(base + CTRL_OFST); - width = (width & ECC_CTRL_BUSWIDTH_MASK) >> ECC_CTRL_BUSWIDTH_SHIFT; - switch (width) { - case DDRCTL_EWDTH_16: - dt = DEV_X2; - break; - case DDRCTL_EWDTH_32: - dt = DEV_X4; - break; - case DDRCTL_EWDTH_64: - dt = DEV_X8; - break; - default: - dt = DEV_UNKNOWN; + u32 regval; + + regval = readl(base + DDR_MSTR_OFST); + if (!(regval & MEM_TYPE_DDR4)) + return DEV_UNKNOWN; + + regval = FIELD_GET(DDR_MSTR_DEV_CFG_MASK, regval); + switch (regval) { + case DDR_MSTR_DEV_X4: + return DEV_X4; + case DDR_MSTR_DEV_X8: + return DEV_X8; + case DDR_MSTR_DEV_X16: + return DEV_X16; + case DDR_MSTR_DEV_X32: + return DEV_X32; } - return dt; + return DEV_UNKNOWN; } /** @@ -727,19 +731,11 @@ static bool zynq_get_ecc_state(void __iomem *base) */ static bool zynqmp_get_ecc_state(void __iomem *base) { - enum dev_type dt; - u32 ecctype; + u32 regval; - dt = zynqmp_get_dtype(base); - if (dt == DEV_UNKNOWN) - return false; + regval = readl(base + ECC_CFG0_OFST) & SCRUB_MODE_MASK; - ecctype = readl(base + ECC_CFG0_OFST) & SCRUB_MODE_MASK; - if ((ecctype == SCRUB_MODE_SECDED) && - ((dt == DEV_X2) || (dt == DEV_X4) || (dt == DEV_X8))) - return true; - - return false; + return (regval == SCRUB_MODE_SECDED); } /**